Is because people aren't treating her like the threat she is. She has the peel capabilities of soraka (maybe slower) yet i have not seen a single person build an executioners. She doesnt get focused often and honestly, completely disregarded, causing lost teamfights -sona/nami main since s4
paired with 
makes her really strong as they do with any heal/shield champ. If people only realized how easy it is to counter her they wouldn't complain as much.
Sorry dude, but the buffs definitely overtuned her
i think a part of this reason is because her utility range is quite high. i thought that +50 range on her aura was nothing but the aura is huge as fuck now, like i remember i made a thread on how her aura range was so small and made me dying because sona was squishy, i know now why riot put the aura range on 350 before.
and her heal range is 1000...
nerf her a little and she will be balanced nicely.
